Unmagnetizable steel.



v v: A

' steel so hard as to To all whbm'it may concern:

Empire of Germany, have invented netism only with" I and only in extraordinarily-email quantities,

UNITED STATES PATEN ICE.

Fmanmcn' KOHLHAAS, OE nnssatnoanenaxms umraeim'rr'zanm sweat;

f Be it:known that I, FRIEDRICH KOIILHAAS, a'subject oi the Emperor of German ,residing at 38 Oranachstrasse, Duss'eldo'r in the certain new and usefullmprovements Rel tin to Unmagnetizable Steel, of which the tol owing is a specification. i Steel having a contentpf ifr'om 10% on of manganese en oys'but':2a'-very small degr' of magnetic permeab' Z eing treatedcomparatively Well; its qualities of density are, much as the limit much higher tensibility, constltntes about 47% of its breaking strength. So this new material is very tough. In spite of this, the

magnetic permeability, that is, the possibilfurther, favorable, inassicna sm a plication filed'flievembcF-IL'IZOIQ; igh! at.

' favorable con tended utilization of the steel tonne variit takes onma ingot-iron and of elasticity, in spite of magnetizable is with regard to itions allow ni hmom exousparposes for which unmagnetiiedor unmagnetic material hasito be-i1sed, such as, e. g, n sh1p-build-ing,- for electric measuring instruments, for'the armament of electric cables, and so on; 1

The new; ste liconmin j the main, thefollowi oopatitutents r approximately 55.8-10.3 0 -""manganese,' .0.9-1% "carbon, 02-14% titanium, maximum 0,8% silicon, maximum 0;'0 3 sulfur,--'maximum 0.015% phosphorus.v

The'steel can ble-furnac'es and in oxidizing martin liturnaces, whereby, ordinarily softlow-caibon manganese areemployed.

I' claim:

be iroduced both in cIuci-' from 80%- to- 85% fe'i'ro-.

- .REIsstI-Enity of asslm-ilating magnetism or oi beinghgii not so -great asiaflie caseare nickel and cobalt. These- Unmagnetiz able isteel containing:' about 9.8'10.3% manganese, about 0.91% 'cartitanium,

bon, about 02-14% sulfur and 0.8% silicon, maximum 0.03% maximum 0.015% phosphorus.

ln'testimony whereof I aflix my signature in presenceof two witnesses.

rmrnni'cil Koreans. \Vitnesses: v i

CHAS. J. Wmqn'r, WALTER VoNNnorrr. 

